Sutherland, who played Jack Bauer, described working on the show as "the greatest education [he's] ever had as an actor", PA reports.

"I don't know why, but somewhere in the early 80s the adage of less was more really took hold with regard to actors and how they would map out their careers," he explained.

"It took something like 24 to get me out of the mindset that less was more, and the reality of working 14 hours a day, five days a week, 10 months of the year for nine years straight - it gave me everything."

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Sutherland also revealed that his role on the show gave him more confidence as an actor.

"It allowed me to break down a script in a way that I certainly wasn't capable of doing before," he said. "It allowed me to see pitfalls and traps that I could not identify as clearly as before and then, most importantly, it gave me a sense of confidence. I will be indebted to the experience that is 24 for the rest of my life."